Air and moisture remaining in the refrigerant system have undesirable effects as indicated below.
1. Pressure in the system rises.
2. Operating current rises.
3. Cooling(or heating) efficiency drops.
4. Moisture in the refrigerant circuit may freeze and block capillary tubing.
5. Water may lead to corrosion of parts in the refrigeration system.
Therefore, the indoor/outdoor unit and connecting tube must be checked for leaks, and vacuumed
to remove non-condensable gas and moisture in the system.
Preparation
• Check that each tube(both liquid and gas side
tubes) between the indoor and outdoor units have
been properly connected and all wiring for the test
run has been completed. Remove the service
valve caps from both the gas and the liquid sides
on the outdoor unit. Check that both the liquid and
the gas side service valves on the outdoor unit are
kept closed at this stage.
Leakage test
• Connect the manifold valve(with pressure gauges)
and dry nitrogen gas cylinder to this service port
with charge hoses.
CAUTION
Be sure to use a manifold valve for leak
testing. The high side manifold valve
must always be kept closed.
• Pressurize the system to no more than 550
P.S.I.G. with dry nitrogen gas and close the
cylinder valve when the gauge reading reached
550 P.S.I.G. Next, test for leaks with liquid soap.
CAUTION
To avoid nitrogen entering the refrigerant
system in a liquid state, the top of the cylinder
must be higher than its bottom when you
pressurize the system. Usually, the cylinder is
used in a vertical standing position.
: Leakage testing shoud be done for
each indoor unit connection set, separately.
1. Do a leakage test of all joints of the
tubing(both indoor and outdoor) and both gas
and liquid side service valves with soap
bubbles.
Bubbles indicate a leak. Be sure to wipe off
the soap with a clean cloth.
2. After the system is found to be free of leaks,
relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen
cylinder. When the system pressure is
reduced to normal, disconnect the hose from
the cylinder.
!
!
NOTICE
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Indoor unit
Outdoor unit
Lo
Hi
Manifold valve
Pressure
gauge
h
The figure can be changed according to model.
42
Multi Air Conditioner
Air Purging and Evacuation
Leak Checking
Air Purging and Evacuation
